If he has_______, he will_______ his research.

Most boys _______ blue to pink while most girls _______ wear pink than blue.

为了向普通读者介绍中国古代园林中“窗”的艺术作用，建筑学家引用下面哪句诗文最为贴切（ ）

We are roommates for 3 years and never once __________ .

Have you seen _______i-phone 5s, Jack—Is it a black one I think I saw ____ somewhere.